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https://www.youtube.com/watch?v=IuW3svdqKZM
Oct 15, 2012 - Uploaded by ChrisFix
How to correctly gap a spark plug. This is a fast and easy video on how to gap a spark plug and spark plug gap ...

Briggs & StrattonFollow this step-by-step image guide to locate spark plugs in different Briggs & Stratton engine types. ... Spark Plug Type & Gap Chart for Briggs & Stratton Engines. Now that you've found the part you'd like to replace, you can use the chart below to identify the genuine Briggs & ...

you should not have to remove the fuel rail to fix your plugs. Find your distributor cap (kinda looks like an octopus with wires going to each piston at the head. Trace these wires to find your plugs. Only do ONE at a time to make sure you keep the correct firing order. Remove the spark plug wire from the plug (it should just pull off ... though you might have to wiggle it back and forth a little bit to get it to come off). Use a spark-plug socket wrench to remove the plug. Before you put your new plug in, make sure that it is gapped correctly (the little metal L is the right spacing from the electrode). To do this, check your user's manual for the correct spacing and get yourself a "gap tool" of the correct size from your local auto-parts store (they can describe exactly how to use it -- and they might even help you gap your plugs before you leave the store). Once you have the plugs all set to go, put it back into the engine with your spark-plug socket wrench. DO NOT FORCE IT -- if the plug is not lined up right, it will get stuck, remove it and try again. Forcing a spark plug into your engine will damage the engine and cost you a lot in repairs -- take your time and be gentle with it. Also, do not over-tighten the plug into the engine as this will also cause damage and be hard to fix. If you have questions about how much to tighten it, ask the auto-parts dealer when you are buying the gap tool ... this can save you a LOT of hassle in the long run. When you have the spark plug where it is supposed to be, and tightened properly, put the wire back on it and that one is done.
Once your first plug is done, move on to the second, and third, etc. Do only one plug at a time so you don't lose track of which wire goes to which plug as this can also cause you a lot of hassle. Once all of the plugs are gapped and installed you should be good to go :-)

did you properly "gap" the spark plugs? many spark plugs have to have the ends properly "gapped" before installation, by using a "gapping" tool/wheel to properly space the arc gap to the correct distance.

if the plugs were properly gapped, or already came pre-gapped out of the box for your specific vehicle, then you may have air getting into the cylinders around the spark plugs. were you careful to properly tighten the spark plugs straightly into place, or is there a chance that you left one loose, or, even worse, cross-threaded one of the spark plugs?

0.042-0.046 is the correct gap for your spark plugs,If it is backfiring now and was not before make sure you were not sold platinum bosch plugs and if you are using factory plugs,then I be looking for a faulty spark plug.Also make sure the firing order is correct.

If it wasn't misfiring before. Make sure you have the proper gap on the spark plugs. Make sure you have the wires connected in the correct order. If you have the old wires, you may want to end up trying those one at a time to make sure you don't have a defect wire either.Thank you,Lee

it should be .054 however You should always use the sticker under the hood
of your vehicle. If for some reason your says .052-.056, then that is
what you use. The stickers on the truck will have the most specific
info for that truck of anything. I need the year to be more sure, also when you buy the plugs, the parts store can tell you the exact gap.